jQuery / Ajax URL引用

actually, problem solved. I made a mistake putting mysql_real_escape() for the post value, so it was accessing the file, but nothing passed to database. Thanks for the help

I have a problem of getting the url within .ajax() to refer to the correct folder

In the root I have folders /functions and /js

My php page included a js file /js/min/custom-ck.js

Inside custom-ck.js, I have .ajax() to refer to php file named updatebg.php within /functions folder (/functions/updatebg.php)

 $.ajax({
        url : '/functions/updatebg.php',
        type : 'POST',
        dataType : 'text',
        data : {
            'bg' : bg
        },

Can someone help me getting the absolute url right? Thanks a lot.

actually, problem solved. I made a mistake putting mysql_real_escape() for the post value, so it was accessing the file, but nothing passed to database. Thanks for the help